# Granddaddy Purple > Granddaddy Purple, often sold as GDP, is an indica that Ken Estes popularized in 2003 and launched in Oakland; most sources list it as Purple Urkle × Big Bud, while Leafly gives Mendo Purps × Skunk × Afghanistan. It tests at a median total THC of 17.87% across 512 state lab tests of Granddaddy Purple flower, with the middle half of results between 15.00% and 21.55%. CBD is negligible: 2 of 439 tests that reported CBD reached 1%. Published by Official Cannabis (https://officialcannabis.net). Lab statistics: 512 state lab tests, median total THC 17.87%, middle half 15.00%–21.55% (Cannlytics cannabis_results, CC BY 4.0, analysis by Official Cannabis). Comparative THC rankings require at least 30 flower tests. ## Guide - [Strain overview](https://granddaddypurplestrain.com/): Granddaddy Purple (GDP) is an indica popularized by Ken Estes in 2003, usually listed as Purple Urkle × Big Bud. Median THC in 512 state lab tests: 17.87%. - [Genetics](https://granddaddypurplestrain.com/genetics/): Granddaddy Purple is an indica, usually listed as Purple Urkle × Big Bud; Leafly says Mendo Purps × Skunk × Afghanistan. Ken Estes’s story, seeds, offspring. - [THC and terpenes](https://granddaddypurplestrain.com/potency/): Granddaddy Purple flower tests at 17.87% median THC (15.00%–21.55%) in 512 state lab results, with limonene leading the terpene panels and almost no CBD. - [Lab report](https://granddaddypurplestrain.com/lab-report/): Lab and menu data for Granddaddy Purple: 512 flower tests, 36% at 20% THC, and 182 Weedmaps listings. - [Effects](https://granddaddypurplestrain.com/effects/): Leafly’s top effects for Granddaddy Purple are sleepy, relaxed and hungry; Weedmaps and AllBud add euphoric. Reported downsides: dry mouth, dry eyes, dizziness. - [Growing](https://granddaddypurplestrain.com/grow/): Granddaddy Purple flowers in about 55–65 days indoors in most listings and finishes outdoors by early October. Breeder specs, yields and heights, side by side. - [Where to find it](https://granddaddypurplestrain.com/near-me/): Granddaddy Purple flower was listed by 58 stores near New York on Weedmaps on Oct 4, 2026; 14 of 27 US markets had none. Counts and eighth prices by market. - [History](https://granddaddypurplestrain.com/history/): From a plant Ken Estes says came from Humboldt to an Oakland launch in 2003, a 2015 Cannabis Cup and #2 in Leafly’s 2025 orders: the history of GDP, sourced. - [FAQ](https://granddaddypurplestrain.com/faq/): Answers to the top questions about Granddaddy Purple (GDP): indica or sativa, parents, Ken Estes, THC, terpenes, CBD, taste, sleepiness, color and flowering. ## Lab report: key findings - Washington and Michigan split sharply for Granddaddy Purple: 81% of Washington tests were at 20% THC or higher, compared with 4.5% in Michigan. - Granddaddy Purple sits low on potency versus peers, ranking 50th of 52 by median THC at 17.87% and 47th by its 3.1% share at 25% or higher. - The terpene lead is almost tied: limonene led 36% of terpene tests, while β-caryophyllene led 33%. - Lab medians for Granddaddy Purple spanned 8.32 points across qualifying labs, but Maryland labs were within 1.63 points. - Median THC rose by +2.58 points from 2018 to 2023, and the Maryland-only comparison moved the same way. - Menus placed Granddaddy Purple in the middle of tracked strains: 182 store listings carrying Granddaddy Purple flower across 13 of 27 Weedmaps markets. Full analysis, tables and method: https://granddaddypurplestrain.com/lab-report/ ## Comparisons - [Granddaddy Purple vs Northern Lights](https://granddaddypurplestrain.com/vs/northern-lights/): Granddaddy Purple vs Northern Lights: two sleepy indicas, grape against pine, compared on state-lab THC (17.87% vs 20.03%), terpenes, lineage and availability. - [Granddaddy Purple vs Grape Ape](https://granddaddypurplestrain.com/vs/grape-ape/): Granddaddy Purple vs Grape Ape: grape-flavored indicas that Leafly gives the same parents, compared on state-lab THC (17.87% vs 18.42%), terpenes and effects. - [Granddaddy Purple vs Purple Urkle](https://granddaddypurplestrain.com/vs/purple-urkle/): Granddaddy Purple vs Purple Urkle, its parent in most accounts: two sleepy grape indicas compared on lab THC (17.87% vs 19.00% from only 35 tests) and lineage. - [Granddaddy Purple vs OG Kush](https://granddaddypurplestrain.com/vs/og-kush/): Granddaddy Purple vs OG Kush: a grape-flavored indica against a woody, piney hybrid first grown in Florida, compared on state-lab THC, terpenes and lineage. - [Granddaddy Purple vs Blue Dream](https://granddaddypurplestrain.com/vs/blue-dream/): Granddaddy Purple vs Blue Dream: #2 and #1 in Leafly’s 2025 orders, a sleepy indica against a creative hybrid, compared on lab THC, terpenes and availability. - [Granddaddy Purple vs Candyland](https://granddaddypurplestrain.com/vs/candyland/): Granddaddy Purple vs Candyland, its sativa child with Bay Platinum Cookies: sleepy against energetic, compared on state-lab THC, terpenes and lineage. ## Data - [Lab test CSV](https://granddaddypurplestrain.com/data/granddaddy-purple-lab-tests.csv): one row per test (state, date, lab, product, THC, CBD, terpenes) - [Full text for LLMs](https://granddaddypurplestrain.com/llms-full.txt)